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介绍各种地下潜孔钻机回转头的结构特点，指出结构设计中几个值得注意的问题，为回转头设计研究提供参考。
In this paper, the structural characteristics of rotary head of various underground DTH drilling rigs are introduced. Some notable problems in structural design are pointed out, which can provide references for the design of rotary head.